JP2013220644A - Automatic grease feeder for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic grease feeder for an injection molding machine, which solves problems related to long-time stopping of an automatic grease feeder and deterioration of a lubricant during the stopping.SOLUTION: A current time Ton when a power source of an automatic grease feeder is turned on is stored and whether or not a completion time Toff of greasing is an initial setting value "0" is determined. In a case of "0", the current step proceeds to a step SA06. In a case of not "0", a stopping time Tp of the automatic grease feeder is calculated, a greasing amount V is calculated using the Tp, whether or not the greasing amount V is larger than the maximum greasing amount Vmax (SA01-SA05) is determined, the greasing amount V is set as the maximum greasing amount Vmax if the greasing amount V is larger than the maximum greasing amount Vmax (SA06), greasing of the greasing amount V is performed if the greasing amount V is not larger than the maximum greasing amount Vmax (SA07), then regular greasing is performed (SA08), the time Toff of completion of the regular greasing is stored (SA09), regular greasing is performed until the power source of the automatic grease feeder is turned off, and greasing is completed as the power source is turned off.

Description

  The present invention relates to an automatic greasing apparatus for an injection molding machine.

  In an injection molding machine, it is necessary to lubricate a lubricant regularly or irregularly in order to prevent wear of sliding surfaces and rotating surfaces of movable parts such as tie bars, ball screws, bearings, and toggle bushes.

When heat is generated by friction on the sliding surface of the movable part of the injection molding machine, the lubricant is deteriorated by the heat and the original characteristics of the lubricant cannot be maintained. For this reason, the technique of performing appropriate oil supply based on the error voltage and work volume of the motor which drives a movable part during operation of an injection molding machine is publicly known (refer to patent documents 1).
On the other hand, the deterioration of the lubricant includes deterioration due to an oxidation reaction (oxidation deterioration) in addition to the deterioration due to heat as described above. It is known that oxidative degradation occurs when the temperature of the atmosphere decreases and water vapor in the air that contacts the lubricant condenses into water, and the moisture content of the lubricant increases (see Patent Document 2). . Thus, when greasing is performed, in addition to the greasing performed according to the operation state of the machine, the greasing periodically performed regardless of the operation state of the machine is necessary for the countermeasure against the oxidative degradation. In the prior art, a technique is known in which grease supply performed according to the operating state (number of shots) of the machine and periodic grease supply are used together (see Patent Document 3). Furthermore, in addition to the greasing performed according to the number of shots and the regular greasing, there is also known a technique of always performing the greasing when the control power source of the molding machine is “ON” (see Patent Document 4).

JP2011-148286A JP 2003-166696 A JP-A-4-71820 JP 11-277600 A

The periodic lubrication disclosed in Patent Document 3 described in the background art is suitable for lubrication even when the lubricant is deteriorated while the machine is stopped. As an effective greasing method.
By the way, the automatic greasing apparatus has a problem that the lubrication is not performed because the control device of the injection molding machine that controls the automatic greasing apparatus is not operated in a state where the power of the injection molding machine is cut off. Further, the deterioration of the lubricant progresses as the machine stop time becomes longer. For this reason, when restarting the injection molding machine after the automatic greasing device has stopped for a long time exceeding the regular greasing interval, the movable part operates with the deteriorated lubricant remaining, There was a problem of causing problems such as wear of the mechanism. However, in the prior art, no countermeasures have been taken against such a long-time stoppage of the automatic greasing device and deterioration of the lubricant during that time. Patent Document 4 discloses that the lubrication is always performed when the control power of the molding machine is “ON”. However, since the lubrication amount at that time does not take into account the length of the machine stop time, There was a possibility that the amount of fat was excessive or too small.
Therefore, in view of the problems of the prior art, the present invention, when it is necessary to lubricate every predetermined time while the automatic greasing device is stopped, at the time when the automatic greasing device becomes operable, It is an object of the present invention to provide an automatic greasing apparatus for an injection molding machine that solves the above problems by performing greasing according to the length of stop time of the automatic greasing apparatus.

The invention according to claim 1 of the present application is an automatic greasing device that lubricates a movable part of an injection molding machine, a stop time measuring unit that measures a stop time of the automatic greasing device, and unit time A greasing amount setting unit for setting the amount of greasing per unit, a greasing amount required during the stop time of the automatic greasing device based on the greasing amount per unit time and the stop time of the automatic greasing device After the greasing amount calculation unit for obtaining the amount and the automatic greasing device are stopped, the automatic greasing device can be restarted, and at least before the operation of the movable portion is started, An automatic greasing apparatus for an injection molding machine, comprising: a greasing execution unit that grinds the obtained greasing amount.
The invention according to claim 2 is an automatic greasing apparatus that lubricates a movable part of an injection molding machine every predetermined time, and a stop time measuring unit that measures a stop time of the automatic greasing apparatus; The greasing number calculation unit for obtaining the number of greasing required during the stop time based on the predetermined time and the stop time of the automatic greasing device, and the automatic greasing device after the automatic greasing device is stopped. An injection molding, comprising: a greasing execution unit for performing the greasing of the required number of greasings at least before starting the operation of the movable part after the re-operation is possible. It is an automatic greasing device of the machine.

In the invention according to claim 3, the stop time of the automatic greasing device is the time from the time when the automatic greasing device completes the greasing to the time when the automatic greasing device becomes operable. The automatic greasing device for an injection molding machine according to claim 1, wherein the automatic greasing device is measured.
In the invention according to claim 4, the stop time of the automatic greasing device is measured from the time when the automatic greasing device stops operating to the time when the automatic greasing device becomes operable. The automatic greasing device for an injection molding machine according to any one of claims 1 and 2.
The invention according to claim 5 is characterized in that the amount of greasing in the first greasing after the automatic greasing device is mounted on the machine is an amount capable of replacing all of the lubricant in the movable part. The automatic greasing apparatus for an injection molding machine according to claim 1.
In the invention according to claim 6, the number of times of greasing in the first greasing after the automatic greasing device is mounted on the machine is the number of times of greasing that can replace all the lubricants of the movable part. The automatic greasing apparatus for an injection molding machine according to claim 2,

  According to the present invention, when the automatic greasing device becomes operable, by performing the greasing according to the length of the stop time of the automatic greasing device, the automatic greasing device is stopped for a long time, and It is possible to provide an automatic greasing device for an injection molding machine that solves the problem of lubricant deterioration during that time.

It is a schematic diagram explaining the automatic greasing apparatus of an injection molding machine. It is a figure explaining the flow of the greasing process of the 1st Embodiment of this invention. It is a figure explaining the flow of the greasing process of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram for explaining an automatic greasing apparatus of an injection molding machine. The mold clamping device includes a mold clamping mechanism, an ejector drive mechanism (not shown), and a mold thickness adjusting mechanism. The mold clamping mechanism opens and closes the mold, and can clamp the mold with a strong force so that the mold does not open due to the pressure of the resin during injection. The rear platen 1 and the fixed platen 13 are connected by four tie bars 15 that constitute a mold clamping mechanism. Between the rear platen 1 and the fixed platen 13, the movable platen 7 is guided by a tie bar 15 and is movably disposed. A fixed mold 11 is attached to the fixed platen 13, and a movable mold 9 is attached to the movable platen 7 so as to face the fixed mold 11.

  Between the rear platen 1 and the movable platen 7, a toggle mechanism including a toggle link 25 constituting a mold clamping mechanism is disposed, and a nut provided on a crosshead of the toggle mechanism is rotatable to the rear platen 1 in the axial direction. It is screwed with a ball screw 17 that is immovably attached. The mold clamping servomotor 21 drives the ball screw 17 through the transmission mechanism 19 to move the movable platen 7 forward and backward in the direction of the fixed platen 13 to close and open the molds 9 and 11. Thus, a toggle type mold clamping device is formed.

  The mold closing operation is an operation of moving the movable platen 7 forward to the fixed platen 13 side. The mold opening operation is an operation of moving the movable platen 7 away from the fixed platen 13 side, that is, an operation of retreating. A position detector 23 for detecting the rotation position (rotation angle) of the mold clamping servomotor 21 is attached to the mold clamping servomotor 21. The mold clamping servo amplifier 8 is provided with a current detector (not shown) for detecting the current flowing through the motor, and the detected current detected by the current detector is controlled via the servo interface 10. 2 is fed back. The control device 2 can acquire the torque value of the mold clamping servomotor 21 from the detected current fed back.

  A grease supply pipe 5 for supplying grease for lubrication to a grease supply point 3 such as a support shaft portion of a toggle link 25 that is movable when the mold clamping servomotor 21 is driven is connected to the mold clamping device. ing. The grease pump 29 that is driven and controlled by the control device 2 described later sends the grease for lubrication stored in the grease cartridge 27 to each grease point 3 via the grease pipe 5. The greasing pump 29 supplies a predetermined amount of lubricant such as grease to each greasing point 3 and automatically stops by issuing a greasing end signal.

  The automatic greasing device constituted by the control device 2, the greasing pipe 5, the greasing pump 29, etc. has a constant greasing amount when the greasing pump 29 is operated once, and an automatic greasing device. There are some that can variably control the amount of greasing when activated. When using an automatic greasing device with a constant greasing amount when the automatic greasing device is operated once, set the greasing amount at the time of factory shipment of the injection molding machine equipped with the automatic greasing device. It is common to leave. On the other hand, in the case of an automatic greasing device that can variably control the amount of greasing, it is common to set the operation time of the timer that activates the automatic greasing device according to the amount of greasing at the time of factory shipment or after factory shipment. is there. The supply amount of lubricant such as grease to each of the greasing points 3 is appropriately adjusted by the thickness of a valve or a greasing pipe 5 in a flow divider not shown.

  The control device 2 is a device that controls the injection molding machine. FIG. 1 shows only the main part of the control device 2. A processor (CPU) 12 that controls the entire injection molding machine controls a servo interface 10 that controls the position, speed, and current (torque) of the mold clamping servomotor 21 and a grease pump 29 via a bus 6. An interface 18 for controlling the display device 20 such as an I / O unit 4 and a liquid crystal display device is connected. The control device 2 has a timer function and a calendar function as in the prior art.

  The servo interface 10 includes a processor, a memory, an interface, and the like, and receives a position feedback signal from a position detector 23 attached to the mold clamping servomotor 21. Furthermore, the servo interface 10 is connected to a mold clamping servomotor 21 via a servo amplifier 8.

  Next, the timing at which the grease supply pump 29 is operated to periodically send a lubricant such as grease stored in the grease cartridge 27 to the grease supply point 3 will be described. There is a method of obtaining the optimum timing by obtaining the grease by operating the grease pump 29 for every predetermined number of shots, every predetermined time, or by calculating the work amount. In the method using the work load, pay attention to the fact that the lubrication state of the movable part of the injection molding machine changes depending on the load on the movable part, the moving speed of the movable part, and the operating time. And comprehensively monitor the lubrication status according to the amount of work. In addition, when the amount of work exceeds a specified value, lubrication is possible at the optimal timing according to changes in molding conditions and the size of the load, causing troubles in moving parts and excessive lubrication. Can be maintained and a good driving state can be maintained.

  The present invention is an automatic greasing device for an injection molding machine, and when the automatic greasing device is required to be lubricated every predetermined time while the automatic greasing device is stopped, the automatic greasing device becomes operable. Thus, by performing the greasing according to the length of the stop time of the automatic greasing device, the problem of the long-time automatic greasing device being stopped and the deterioration of the lubricant during that time is solved.

Hereinafter, the greasing method of the present invention will be described. When the automatic greasing device can be reactivated, the amount of greasing required while the automatic greasing device is stopped is obtained, and is obtained at least before the movable part of the injection molding machine starts operating. What is necessary is just to lubricate according to the required amount of lubrication. Not only immediately after the automatic greasing device is ready for operation, but also when the automatic greasing device is ready for operation and the injection molding machine starts operation. If you want, you can do it anytime.
The length of the automatic greasing device stop time is preferably measured from the time when the automatic greasing device completes the greasing to the time when it becomes operational again. You may measure the time from the time when an automatic greasing device stopped operation by turning off a power supply to the time when it became a state where it can be operated again.

  The first method for obtaining the amount of greasing is to set the necessary amount of greasing Vh (cc / h) per unit time in advance, and when the greasing becomes possible, the automatic feeding according to (Equation 1). The greasing amount V (cc) may be obtained according to the length of stop time Tp (h) of the greasing device, and only the obtained greasing amount V (cc) may be fed. (H) is time and (cc) is a unit representing volume.

V = Vh × Tp (Formula 1)
Even when the automatic greasing device has a very long stoppage time, the lubrication amount V may be a maximum Vmax that can replace all of the lubricant in the movable part.
By the way, when the lubrication is performed for the first time after the assembly of the injection molding machine is completed, it is necessary to supply the movable part with a sufficient amount of lubrication V as well as the lubrication amount V. For this reason, it is desirable to apply Vmax as the greasing amount V in the first greasing after the automatic greasing device is mounted on the injection molding machine.

  The second method for determining the amount of greasing is the greasing that is required during the time Tp (h) when the greasing is stopped in the automatic greasing apparatus that greasing the predetermined amount every predetermined time Ts (h). The number of times C (times) may be obtained, and the lubrication for the obtained number of times C (times) may be performed when the lubrication becomes possible. (Expression 2) When a fraction occurs in Expression 2, the number of times C (times) may be obtained by rounding up.

C = Tp / Ts (Formula 2)
In addition, even if it is a case where the stop time of an automatic greasing apparatus is very long, the number C of greasing should just be the number Cmax which can replace all the lubricants of a movable part at the maximum. By the way, when greasing for the first time after the assembly of the machine is completed, it is necessary to supply the movable part with a sufficient amount of the greasing amount V as well as to remember the greasing. For this reason, it is desirable to apply the above-mentioned Cmax as the number C of greasing in the first greasing after the automatic greasing device is mounted on the machine.

  The present invention is an invention related to an automatic greasing apparatus that lubricates every predetermined time. However, in a state where the automatic greasing apparatus can be operated, the conventional technique of greasing for each number of shots and the operation state of the injection molding machine. You may use the corresponding lubrication together.

  As described above, according to the present invention, even when the injection molding machine is operated after greasing has been stopped for a long time, an appropriate amount of greasing is performed according to the length of the stop time of the automatic greasing device. Is called. As a result, it is possible to prevent wear of the sliding surface and the rotating surface of the movable part when the injection molding machine is restarted.

FIG. 2 is a diagram illustrating the flow of the greasing process according to the first embodiment of the present invention. Hereinafter, it demonstrates according to each step.
[Step SA01] The current time Ton when the automatic greasing device is turned on is stored. [Step SA02] It is determined whether or not the time Toff at which the lubrication is completed is “0” which is an initial setting value. If “0” (in the case of YES), the process proceeds to Step SA06 and “0” If not (NO), the process proceeds to step SA03. When the automatic greasing device is turned on for the first time, Toff = 0.
[Step SA03] The automatic lubricator stop time Tp is calculated. The calculation formula is Tp = Ton−Toff.
[Step SA04] The greasing amount V is calculated. The calculation formula is V = Vh * Tp. Vh is the amount of grease required per unit time.
[Step SA05] It is determined whether or not the greasing amount V is greater than the maximum greasing amount Vmax. If it is large (in the case of YES), the process proceeds to Step SA06, and if it is not large (in the case of NO), Step SA07 is performed. Migrate to Vmax is a greasing amount necessary to replace all lubricants in the movable part.
[Step SA06] The greasing amount V is set to the maximum greasing amount Vmax.
[Step SA07] Grease with the greasing amount V is executed.
[Step SA08] Regular lubrication is executed.
[Step SA09] The time Toff at which the greasing is completed is stored.
[Step SA10] It is determined whether or not the power supply of the automatic greasing device is off. If it is off (in the case of YES), the process ends. If not (in the case of NO), the process returns to Step SA08. Continue processing.

FIG. 3 is a diagram for explaining the flow of the greasing process according to the second embodiment of the present invention. Hereinafter, it demonstrates according to each step.
[Step SB01] The current time Ton when the automatic greasing device is turned on is stored. [Step SB02] It is determined whether or not the time Toff at which the lubrication is completed is “0” which is an initial setting value. If “0” (in the case of YES), the process proceeds to Step SB06 and “0”. If not (NO), the process proceeds to step SB03. When the automatic greasing device is turned on for the first time, Toff = 0.
[Step SB03] The automatic greasing device stop time Tp is calculated. The calculation formula is Tp = Ton−Toff. Ts is a predetermined greasing interval (time).
[Step SB04] The number C of greasing is calculated. The calculation formula is C = Tp / Ts. Note that Ts is the time of a predetermined greasing interval.
[Step SB05] It is determined whether or not the number of times of greasing C is greater than the maximum number of times of greasing Cmax. If it is large (in the case of YES), the process proceeds to Step SB06. Migrate to Cmax is the number of greasing required to replace all lubricants in the movable part.
[Step SB06] The lubrication frequency C is set to the maximum lubrication frequency Cmax.
[Step SB07] C lubrication is executed.
[Step SB08] Regular lubrication is executed.
[Step SB09] The time Toff at which the greasing is completed is stored.
[Step SB10] It is determined whether or not the power supply of the automatic greasing device is off. If it is off (in the case of YES), the process is terminated, and if it is not off (in the case of NO), the process returns to Step SB08. Continue processing.

DESCRIPTION OF SYMBOLS 1 Rear platen 2 Control apparatus 3 Grease point 4 I / O unit 5 Grease pipe 6 Bus 7 Movable platen 8 Servo amplifier 9 Movable side mold 10 Servo interface 11 Fixed side mold 12 Processor 13 Fixed platen 14 RAM
15 tie bar 16 ROM
17 Ball screw 18 Interface 19 Transmission mechanism 20 Display device 21 Mold clamping servomotor 23 Position detector 25 Toggle link 27 Grease cartridge 29 Grease pump

Claims (6)

An automatic greasing device that lubricates a movable part of an injection molding machine,
A stop time measuring unit for measuring the stop time of the automatic greasing device;
A greasing amount setting unit for setting a greasing amount per unit time;
A greasing amount calculation unit for obtaining a necessary greasing amount during the stop time of the automatic greasing device based on the greasing amount per unit time and the stop time of the automatic greasing device,
After the automatic greasing device is stopped, after the automatic greasing device is ready for re-operation, at least before starting the operation of the movable part, the greasing amount of the obtained greasing amount is applied. A greasing execution unit to perform,
An automatic greasing device for an injection molding machine. An automatic greasing device that lubricates a movable part of an injection molding machine every predetermined time,
A stop time measuring unit for measuring the stop time of the automatic greasing device;
A greasing number calculating unit for obtaining the number of greasing required during the stop time based on the predetermined time and the stop time of the automatic greasing device,
After the automatic greasing device is stopped, after the automatic greasing device is ready for re-operation, at least before the operation of the movable part is started, the greasing is performed for the determined number of times. A greasing execution unit;
An automatic greasing device for an injection molding machine.   The stop time of the automatic greasing device is measured from the time when the automatic greasing device completes the greasing to the time when the automatic greasing device becomes operable. Item 3. An automatic greasing apparatus for an injection molding machine according to any one of Items 1 and 2.   The stop time of the automatic greasing device is measured from the time when the automatic greasing device stops operation to the time when the automatic greasing device becomes operable. The automatic greasing apparatus of the injection molding machine as described in any one of 1 or 2.   The injection according to claim 1, wherein the amount of lubrication in the first lubrication after the automatic greasing device is mounted on the machine is an amount capable of replacing all of the lubricant in the movable part. Automatic greasing equipment for molding machines.   The number of times of greasing in the first greasing after the automatic greasing device is mounted on the machine is the number of times of greasing that can replace all of the lubricant in the movable part. Automatic greasing equipment for injection molding machines.

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